CN108588337A - A kind of nanometer dephosphorization slag former and preparation method thereof suitable for middle high phosphorus molten steel - Google Patents
A kind of nanometer dephosphorization slag former and preparation method thereof suitable for middle high phosphorus molten steel Download PDFInfo
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- CN108588337A CN108588337A CN201810579436.9A CN201810579436A CN108588337A CN 108588337 A CN108588337 A CN 108588337A CN 201810579436 A CN201810579436 A CN 201810579436A CN 108588337 A CN108588337 A CN 108588337A
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- dephosphorization
- slag former
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- dephosphorization slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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Abstract
The nanometer dephosphorization slag former and preparation method thereof that the invention discloses a kind of suitable for middle high phosphorus molten steel.According to percent by weight comprising following component：Nanometer CaO 20%~38%, nanometer BaO 5~15%, FeO 10~20%, Al2O33%~18%, SiO210%~20%, MgO 1.8~10%.Rapid slagging when high phosphorus molten steel top-blown converter dephosphorization is made steel during the slag former of the middle high phosphorus liquid steel dephosphorization of the present invention can promote, the middle high phosphorus molten steel that can be 0.025% 0.080% by P elements weight percentage by " double slag process ", dephosphorization is to 0.015% or less, decarburization converter less-slag melting ultra-low phosphoretic steel production technology, good result is achieved by process optimization, clean steel is produced for mammoth conveter, efficient low-phosphorus steel smelting provides the guidance of theory and practice.
Description
Technical field
The present invention relates to iron and steel smelting technology fields, especially a kind of nanometer dephosphorization slag former suitable for middle high phosphorus molten steel
And preparation method thereof.
Background technology
In converter, by phosphorus content control in rational level, therefore high efficiency, low cost converter dephosphorization technique is studied very
It is necessary.There is an urgent need to find the stability and high efficiency converter dephosphorization technique for meeting produce reality, meet high-volume, high-cleanness steel
The needs of production.
Phosphorus is surface reactive material in iron liquid, and the presence of phosphorus can substantially reduce boundary tension of the iron liquid with clinker,
And phosphorus is easier to be enriched on interface；Oxygen is also typical surface reactive material, is easy in surface enrichment, this promotes the moon from
Son 02-With the gradually combination of phosphorus atoms, therefore dephosphorisation reaction carries out comparatively fast.Dephosphorisation reaction can be summarized as：
(1) initial reaction stage, oxygen content is low in molten iron, and Threshing injury is slow, and gas phase is to the limitation that the oxygen supply of molten iron is dephosphorisation reaction
Property link；
(2) mid-term is reacted, molten iron oxygen content is continuously increased and reaches certain value, and Threshing injury is constantly accelerated to reach certain
Value, as oxygen content reaches high value, the transmission no less important of oxygen supply and phosphorus；
(3) it reacts the later stage, phosphorus content reduces in steel, and Threshing injury also reduces therewith, and dephosphorization product is in soild oxide
It is restricted link that side, which is transmitted, and dephosphorisation reaction tends to balance；
(4) Tuo Pity speed increase with the increase of partial pressure of gaseous oxygen and gas flow, and in speed of oxygen supply hour, phosphorus, oxygen close
It is close to balanced line：When speed of oxygen supply is big, the oxygen content in metal is higher by equilibrium valve 0.06%~0.09%.
On the basis of considering molten iron pretreatment, pneumatic steelmaking " more slag methods " and " duplex practice " dephosphorization, exploitation is efficient
Dephosphorization slag making system and optimization dephosphorization technology parameter, realize converter high efficiency dephosphorating purpose.
Invention content
In view of the above technical problems, the purpose of the present invention is to provide a kind of nanometer dephosphorizations suitable for middle high phosphorus molten steel to make
Slag agent and preparation method thereof.The present invention prepares that raw material sources are extensive, and of low cost, preparation method is simple；Nanometer dephosphorization obtained
The phosphorus content of high phosphorus molten steel during slag former can be reduced effectively.
Technical scheme of the present invention is specifically described as follows.
A kind of nanometer dephosphorization slag former suitable for middle high phosphorus molten steel, according to percent by weight comprising following component：
Nanometer CaO 20%~38%, nanometer BaO 5~15%, FeO 10~20%, Al2O33%~18%, SiO210%~
20%, 1.8~10% MgO.
In the present invention, nanometer CaO 21%~35%, nanometer BaO 6~12%, FeO 10~18%, Al2O39%~
15%, SiO210%~20%, MgO 1.8~5%.
Further include adhesive in the present invention.
In the present invention, grain size is between 5-150nm.
The present invention also provides a kind of preparation methods of the above-mentioned nanometer dephosphorization slag former suitable for middle high phosphorus molten steel, specific to walk
It is rapid as follows：
It is mixed after first at room temperature weighing raw material in proportion, adds adhesive modified starch, be uniformly mixed, be sent into and squeeze
It presses equipment to squeeze, obtains a nanometer dephosphorization slag former.
In the present invention, crushing strength is 10~22 megapascal.
In the present invention, CaO derives from quick lime or/and light dolomite；Raw material FeO derives from oxidizing slag, Al2O3Come
Derived from bauxite, SiO2From silica, MgO derives from light dolomite.
Compared to the prior art, the beneficial effects of the present invention are：The slag former of the efficient nano dephosphorization of middle high phosphorus molten steel
Rapid slagging when high phosphorus molten steel top-blown converter dephosphorization is made steel in can promoting, can be contained P elements weight percent by " double slag process "
Amount is the middle high phosphorus molten steel of 0.025%-0.080%, and dephosphorization to 0.015% is hereinafter, for mammoth conveter clean steel, efficient low-phosphorus steel
The guidance that theory and practice is provided is smelted, is had very important significance.
Specific implementation mode
It describes in detail to technical scheme of the present invention with reference to embodiment.
Embodiment 1
Raw material proportioning presses table 1.
Table 1
Quick lime and barium monoxide are first separately added into nanon ball-mill at room temperature, it is straight to prepare particle respectively by Physical
Diameter mixes after the raw materials such as 1~100 nanometer of nanometer CaO, nanometer BaO weigh in proportion, and typical binders modified starch is added,
It is uniformly mixed, is sent into the symmetrical ball press of extrusion equipment nanometer and squeezes, 10~22 megapascal of crushing strength, granular size is received for 5~150
The nanometer Ca-Ba dephosphorization slag systems of rice.
The chemical composition of gained dephosphorization slag former be nanometer CaO 19.8%, nanometer BaO12.8%, FeO 14.5%,
Al2O39.6%, SiO216.2%, MgO 5%；Remaining is impurity.
The nanometer dephosphorization slag former of production is used in the enterprising enforcement of 300t converters, and equivalent substitution used originally it is congruent
Conventional dephosphorization slag former, ton steel addition is up to 30kg.Under the conditions of same liquid steel temperature and molten steel composition, when nanometer is de-
Phosphorus slag former additive amount be 10kg/t steel when, compared compared with using congruent conventional dephosphorization slag former, molten steel phosphorus content by
0.036wt% is reduced to 0.020%；Additive amount is relatively compared using equivalent routine dephosphorization slag former, molten steel phosphorus in 20kg/t steel
Content is reduced to 0.018% by 0.035%；Additive amount relatively uses equivalent routine dephosphorization slag former phase when higher than 30kg/t steel
Than molten steel phosphorus content is reduced to 0.015% by 0.035%.After this nanometer dephosphorization slag former, end phosphorus content is compared with equivalent
For congruent conventional dephosphorization slag former, average dephosphorization effect becomes apparent.
After nanometer dephosphorization slag former provided in an embodiment of the present invention, the grain fineness in initial stage slag is increased, is accelerated
Slugging speed improves lime melting rate, improves dephosphorization effect in smelting process, greatly improves dephosphorization rate.This dephosphorization slag making
Agent makes molten steel finishing slag basicity be increased to 2.16 by 1.86, and slugging is with obvious effects.
Embodiment 2
Raw material proportioning presses table 2.
Table 2
Quick lime and barium monoxide are first separately added into nanon ball-mill at room temperature, it is straight to prepare particle respectively by Physical
Nanometer CaO, nanometer BaO of the diameter at 30~80 nanometers, then mixed after raw material is weighed in proportion, typical binders are added and are modified and form sediment
Powder is uniformly mixed, and is sent into the symmetrical ball press of extrusion equipment nanometer and is squeezed, 12~25 megapascal of crushing strength, and granular size is 30~
90 nanometers of nanometer Ca-Ba dephosphorization slag systems.
The chemical composition of gained dephosphorization slag former be nanometer CaO 16.2%, nanometer BaO9.9%, FeO 16.2%,
Al2O39.0%, SiO213.5%, MgO 4.5%；Remaining is impurity.
The nanometer dephosphorization slag former of production is used in the enterprising enforcement of 210t converters, and equivalent substitution used originally it is congruent
Conventional dephosphorization slag former, ton steel addition is up to 41kg.Under the conditions of same liquid steel temperature and molten steel composition, when nanometer is de-
Phosphorus slag former additive amount be 15kg/t steel when, compared compared with using congruent conventional dephosphorization slag former, molten steel phosphorus content by
0.041% is reduced to 0.032%；Additive amount is relatively compared using equivalent routine dephosphorization slag former, molten steel phosphorus contains in 30kg/t steel
Amount is reduced to 0.022% by 0.040%；Additive amount is relatively compared using equivalent routine dephosphorization slag former when higher than 41kg/t steel,
Molten steel phosphorus content is reduced to 0.015% by 0.040%.After this nanometer dephosphorization slag former, end phosphorus content is same compared with equivalent
For the conventional dephosphorization slag former of ingredient, average dephosphorization effect becomes apparent.
After nanometer dephosphorization slag former provided in an embodiment of the present invention, the grain fineness in initial stage slag is increased, is accelerated
Slugging speed improves lime melting rate, improves dephosphorization effect in smelting process, greatly improves dephosphorization rate.This dephosphorization slag making
Agent makes molten steel finishing slag basicity be increased to 2.09 by 1.83, and slugging is with obvious effects.
Embodiment 3
Raw material proportioning presses table 3.
Table 3
Quick lime and barium monoxide are first separately added into nanon ball-mill at room temperature, it is straight to prepare particle respectively by Physical
Nanometer CaO, nanometer BaO of the diameter at 25~95 nanometers；It is mixed after raw material is weighed in proportion again, typical binders is added and are modified and form sediment
Powder is uniformly mixed, and is sent into the symmetrical ball press of extrusion equipment nanometer and is squeezed, 12~25 megapascal of crushing strength, and granular size is 20~
100 nanometers of nanometer Ca-Ba dephosphorization slag systems.
The chemical composition of gained dephosphorization slag former be nanometer CaO 20.1%, nanometer BaO6%, FeO 10%,
Al2O315%, SiO2%, MgO 1.9%；Remaining is impurity.
The nanometer dephosphorization slag former of production is used in the enterprising enforcement of 110t converters, and equivalent substitution used originally it is congruent
Conventional dephosphorization slag former, ton steel addition is up to 45kg.Under the conditions of same liquid steel temperature and molten steel composition, when nanometer is de-
Phosphorus slag former additive amount be 20kg/t steel when, compared compared with using congruent conventional dephosphorization slag former, molten steel phosphorus content by
0.045% is reduced to 0.024%；Additive amount is relatively compared using equivalent routine dephosphorization slag former, molten steel phosphorus contains in 30kg/t steel
Amount is reduced to 0.018% by 0.043%；Additive amount is relatively compared using equivalent routine dephosphorization slag former when higher than 45kg/t steel,
Molten steel phosphorus content is reduced to 0.014% by 0.043%.After this nanometer dephosphorization slag former, end phosphorus content is same compared with equivalent
For the conventional dephosphorization slag former of ingredient, average dephosphorization effect becomes apparent.
After nanometer dephosphorization slag former provided in an embodiment of the present invention, the grain fineness in initial stage slag is increased, is accelerated
Slugging speed improves lime melting rate, improves dephosphorization effect in smelting process, greatly improves dephosphorization rate.This dephosphorization slag making
Agent makes molten steel finishing slag basicity be increased to 2.10 by 1.91, and slugging is with obvious effects.
It should be noted that the above specific implementation mode is merely illustrative of the technical solution of the present invention and unrestricted, although
It is described the invention in detail with reference to embodiment, it will be understood by those of ordinary skill in the art that, it can be to the present invention's
Technical solution is modified or replaced equivalently, and without departing from the spirit of the technical scheme of the invention and range, should all be covered
In scope of the presently claimed invention.
Claims (7)
1. a kind of nanometer dephosphorization slag former suitable for middle high phosphorus molten steel, which is characterized in that according to percent by weight comprising
Following component：Nanometer CaO 20%~38%, nanometer BaO 5~15%, FeO 10~20%, Al2O33%~18%, SiO2
10%~20%, MgO 1.8~10%.
2. according to claim 1 nanometer of dephosphorization slag former, which is characterized in that nanometer CaO 21%~35%, nanometer BaO
6~12%, FeO 10~18%, Al2O39%~15%, SiO210%~20%, MgO 1.8~5%.
3. according to claim 1 nanometer of dephosphorization slag former, which is characterized in that further include adhesive.
4. according to claim 1 nanometer of dephosphorization slag former, which is characterized in that its grain size is between 5-150nm.
5. a kind of preparation method of nanometer dephosphorization slag former according to claim 1, which is characterized in that specific steps are such as
Under：It is mixed after first at room temperature weighing raw material in proportion, adds adhesive modified starch, be uniformly mixed, be sent into extruding and set
It is standby to squeeze, obtain a nanometer dephosphorization slag former.
6. preparation method according to claim 5, which is characterized in that crushing strength is 10~22 megapascal.
7. preparation method according to claim 5, which is characterized in that CaO derives from quick lime or light-burned white clouds
Stone；Raw material FeO derives from oxidizing slag, Al2O3From bauxite, SiO2From silica, MgO derives from light dolomite.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498976A (en) * | 2002-11-06 | 2004-05-26 | 李永春 | Desulfurizer based on nano composite calcium carbide and calcium oxide for steel |
| CN1727298A (en) * | 2004-07-27 | 2006-02-01 | 上海盘龙实业有限公司 | Nuisance free dephosphorized foaming slag in barium series with iron one containing BaSo2 as raw material |
| CN101532070A (en) * | 2009-03-26 | 2009-09-16 | 方克明 | Steel fusant desulfurizer |
| CN102296153A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel premelting dephosphorization agent for steel making and preparation method thereof |
| CN103060522A (en) * | 2013-02-08 | 2013-04-24 | 武钢集团昆明钢铁股份有限公司 | Slag forming agent for dephosphorization of medium-high-phosphorus semisteel and preparation method of slag forming agent |
-
2018
- 2018-06-07 CN CN201810579436.9A patent/CN108588337A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1498976A (en) * | 2002-11-06 | 2004-05-26 | 李永春 | Desulfurizer based on nano composite calcium carbide and calcium oxide for steel |
| CN1727298A (en) * | 2004-07-27 | 2006-02-01 | 上海盘龙实业有限公司 | Nuisance free dephosphorized foaming slag in barium series with iron one containing BaSo2 as raw material |
| CN101532070A (en) * | 2009-03-26 | 2009-09-16 | 方克明 | Steel fusant desulfurizer |
| CN102296153A (en) * | 2011-08-22 | 2011-12-28 | 辽宁天和科技股份有限公司 | Novel premelting dephosphorization agent for steel making and preparation method thereof |
| CN103060522A (en) * | 2013-02-08 | 2013-04-24 | 武钢集团昆明钢铁股份有限公司 | Slag forming agent for dephosphorization of medium-high-phosphorus semisteel and preparation method of slag forming agent |
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Application publication date: 20180928 |